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kicad/common/stroke_params.cpp

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2021-2022 KiCad Developers, see AUTHORS.txt for contributors.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <macros.h>
#include <base_units.h>
#include <string_utils.h>
#include <eda_rect.h>
#include <render_settings.h>
#include <geometry/shape.h>
#include <geometry/shape_segment.h>
#include <geometry/shape_simple.h>
#include <geometry/geometry_utils.h>
#include <stroke_params.h>
#include <trigo.h>
using namespace STROKEPARAMS_T;
void STROKE_PARAMS::Stroke( const SHAPE* aShape, PLOT_DASH_TYPE aLineStyle, int aWidth,
const KIGFX::RENDER_SETTINGS* aRenderSettings,
std::function<void( const VECTOR2I& a, const VECTOR2I& b )> aStroker )
{
double strokes[6] = { aWidth * 1.0, aWidth * 1.0, aWidth * 1.0, aWidth * 1.0, aWidth * 1.0,
aWidth * 1.0 };
int wrapAround = 6;
switch( aLineStyle )
{
case PLOT_DASH_TYPE::DASH:
strokes[0] = aRenderSettings->GetDashLength( aWidth );
strokes[1] = aRenderSettings->GetGapLength( aWidth );
wrapAround = 2;
break;
case PLOT_DASH_TYPE::DOT:
strokes[0] = aRenderSettings->GetDotLength( aWidth );
strokes[1] = aRenderSettings->GetGapLength( aWidth );
wrapAround = 2;
break;
case PLOT_DASH_TYPE::DASHDOT:
strokes[0] = aRenderSettings->GetDashLength( aWidth );
strokes[1] = aRenderSettings->GetGapLength( aWidth );
strokes[2] = aRenderSettings->GetDotLength( aWidth );
strokes[3] = aRenderSettings->GetGapLength( aWidth );
wrapAround = 4;
break;
case PLOT_DASH_TYPE::DASHDOTDOT:
strokes[0] = aRenderSettings->GetDashLength( aWidth );
strokes[1] = aRenderSettings->GetGapLength( aWidth );
strokes[2] = aRenderSettings->GetDotLength( aWidth );
strokes[3] = aRenderSettings->GetGapLength( aWidth );
strokes[4] = aRenderSettings->GetDotLength( aWidth );
strokes[5] = aRenderSettings->GetGapLength( aWidth );
wrapAround = 6;
break;
default:
UNIMPLEMENTED_FOR( lineTypeNames.at( aLineStyle ).name );
}
switch( aShape->Type() )
{
case SH_SIMPLE:
{
const SHAPE_SIMPLE* poly = static_cast<const SHAPE_SIMPLE*>( aShape );
for( size_t ii = 0; ii < poly->GetSegmentCount(); ++ii )
{
SEG seg = poly->GetSegment( ii );
SHAPE_SEGMENT line( seg.A, seg.B );
STROKE_PARAMS::Stroke( &line, aLineStyle, aWidth, aRenderSettings, aStroker );
}
}
break;
case SH_SEGMENT:
{
const SHAPE_SEGMENT* line = static_cast<const SHAPE_SEGMENT*>( aShape );
VECTOR2D start = line->GetSeg().A;
VECTOR2D end = line->GetSeg().B;
EDA_RECT clip( (VECTOR2I) start, wxSize( end.x - start.x, end.y - start.y ) );
clip.Normalize();
double theta = atan2( end.y - start.y, end.x - start.x );
for( size_t i = 0; i < 10000; ++i )
{
// Calculations MUST be done in doubles to keep from accumulating rounding
// errors as we go.
VECTOR2D next( start.x + strokes[ i % wrapAround ] * cos( theta ),
start.y + strokes[ i % wrapAround ] * sin( theta ) );
// Drawing each segment can be done rounded to ints.
VECTOR2I a( KiROUND( start.x ), KiROUND( start.y ) );
VECTOR2I b( KiROUND( next.x ), KiROUND( next.y ) );
if( ClipLine( &clip, a.x, a.y, b.x, b.y ) )
break;
else if( i % 2 == 0 )
aStroker( a, b );
start = next;
}
}
break;
case SH_ARC:
{
const SHAPE_ARC* arc = static_cast<const SHAPE_ARC*>( aShape );
double r = arc->GetRadius();
double C = 2.0 * M_PI * r;
VECTOR2I center = arc->GetCenter();
VECTOR2D startRadial( arc->GetP0() - center );
EDA_ANGLE startAngle( startRadial );
VECTOR2D endRadial( arc->GetP1() - center );
EDA_ANGLE arcEndAngle( endRadial );
if( arcEndAngle == startAngle )
arcEndAngle = startAngle + ANGLE_360; // ring, not null
if( startAngle > arcEndAngle )
{
if( arcEndAngle < ANGLE_0 )
arcEndAngle = arcEndAngle.Normalize();
else
startAngle = startAngle.Normalize() - ANGLE_360;
}
wxASSERT( startAngle < arcEndAngle );
for( size_t i = 0; i < 10000 && startAngle < arcEndAngle; ++i )
{
EDA_ANGLE theta = ANGLE_360 * strokes[ i % wrapAround ] / C;
EDA_ANGLE endAngle = std::min( startAngle + theta, arcEndAngle );
if( i % 2 == 0 )
{
VECTOR2I a( center.x + r * startAngle.Cos(), center.y + r * startAngle.Sin() );
VECTOR2I b( center.x + r * endAngle.Cos(), center.y + r * endAngle.Sin() );
aStroker( a, b );
}
startAngle = endAngle;
}
}
break;
case SH_CIRCLE:
// A circle is always filled; a ring is represented by a 360° arc.
KI_FALLTHROUGH;
default:
UNIMPLEMENTED_FOR( SHAPE_TYPE_asString( aShape->Type() ) );
}
}
static wxString getLineStyleToken( PLOT_DASH_TYPE aStyle )
{
wxString token;
switch( aStyle )
{
case PLOT_DASH_TYPE::DASH: token = wxT( "dash" ); break;
case PLOT_DASH_TYPE::DOT: token = wxT( "dot" ); break;
case PLOT_DASH_TYPE::DASHDOT: token = wxT( "dash_dot" ); break;
case PLOT_DASH_TYPE::DASHDOTDOT: token = wxT( "dash_dot_dot" ); break;
case PLOT_DASH_TYPE::SOLID: token = wxT( "solid" ); break;
case PLOT_DASH_TYPE::DEFAULT: token = wxT( "default" ); break;
}
return token;
}
void STROKE_PARAMS::Format( OUTPUTFORMATTER* aFormatter, int aNestLevel ) const
{
wxASSERT( aFormatter != nullptr );
if( GetColor() == KIGFX::COLOR4D::UNSPECIFIED )
{
aFormatter->Print( aNestLevel, "(stroke (width %s) (type %s))",
FormatInternalUnits(GetWidth() ).c_str(),
TO_UTF8( getLineStyleToken( GetPlotStyle() ) ) );
}
else
{
aFormatter->Print( aNestLevel, "(stroke (width %s) (type %s) (color %d %d %d %s))",
FormatInternalUnits(GetWidth() ).c_str(),
TO_UTF8( getLineStyleToken( GetPlotStyle() ) ),
KiROUND( GetColor().r * 255.0 ),
KiROUND( GetColor().g * 255.0 ),
KiROUND( GetColor().b * 255.0 ),
Double2Str( GetColor().a ).c_str() );
}
}
void STROKE_PARAMS_PARSER::ParseStroke( STROKE_PARAMS& aStroke )
{
for( T token = NextTok(); token != T_RIGHT; token = NextTok() )
{
if( token != T_LEFT )
Expecting( T_LEFT );
token = NextTok();
switch( token )
{
case T_width:
aStroke.SetWidth( parseDouble( "stroke width" ) * m_iuPerMM );
NeedRIGHT();
break;
case T_type:
{
token = NextTok();
switch( token )
{
case T_dash: aStroke.SetPlotStyle( PLOT_DASH_TYPE::DASH ); break;
case T_dot: aStroke.SetPlotStyle( PLOT_DASH_TYPE::DOT ); break;
case T_dash_dot: aStroke.SetPlotStyle( PLOT_DASH_TYPE::DASHDOT ); break;
case T_dash_dot_dot: aStroke.SetPlotStyle( PLOT_DASH_TYPE::DASHDOTDOT ); break;
case T_solid: aStroke.SetPlotStyle( PLOT_DASH_TYPE::SOLID ); break;
case T_default: aStroke.SetPlotStyle( PLOT_DASH_TYPE::DEFAULT ); break;
default:
Expecting( "solid, dash, dash_dot, dash_dot_dot, dot or default" );
}
NeedRIGHT();
break;
}
case T_color:
{
KIGFX::COLOR4D color;
color.r = parseInt( "red" ) / 255.0;
color.g = parseInt( "green" ) / 255.0;
color.b = parseInt( "blue" ) / 255.0;
color.a = Clamp( parseDouble( "alpha" ), 0.0, 1.0 );
aStroke.SetColor( color );
NeedRIGHT();
break;
}
default:
Expecting( "width, type, or color" );
}
}
}
int STROKE_PARAMS_PARSER::parseInt( const char* aText )
{
T token = NextTok();
if( token != T_NUMBER )
Expecting( aText );
return atoi( CurText() );
}
double STROKE_PARAMS_PARSER::parseDouble( const char* aText )
{
T token = NextTok();
if( token != T_NUMBER )
Expecting( aText );
double val = strtod( CurText(), NULL );
return val;
}
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